Determination of GT-transition strengths in A = 34 isobars using charge exchange exchange (3He, t) reaction

Under the assumption that isospin T is a good quantum number, mirror transitions Tz = +1→ 0 and Tz = -1→ 0 were studied in A = 34 isobars, where T z is z component of isospin T and is defined by Tz = (N -Z)/2. With a high energy resolution of 35 keV in 34S(3He,t)34Cl reaction measurement at 0o scattering angle and at an incident energy of 140 MeV/nucleon, strengths of Fermi and Gamow-Teller (GT) transitions from the Jπ = 0+, Tz = +1 ground state of 34S to the Jπ = 1+, Tz = 0 excited states in 34Cl were determined up to excitation energy (Ex) of 7.08 MeV. The corresponding isospin-symmetric transitions connecting Tz = -1 and Tz = 0 states can be studied in the 34Ar β+ decay. The strengths of the (GT)± transitions were compared up to the excitation energy of 3.1 MeV. A good agreement was observed for two strong transitions to 2.580 MeV and 3.129 MeV states, while a disagreement about 45% was observed for a weaker transition to 0.666 MeV low-lying state. (author)